William Jack Poulter, born 28 January 1993, is an English actor. He first gained recognition for his role as Eustace Scrubb in the fantasy adventure film The Chronicles of Narnia: The Voyage of the Dawn Treader (2010). Poulter received further praise for his starring role in the comedy film We’re the Millers (2013), for which he won the BAFTA Rising Star Award.
Poulter also starred in the science fiction film The Maze Runner (2014) and the sequel Maze Runner: The Death Cure (2018), the period epic film The Revenant (2015), the crime drama film Detroit (2017), the interactive science fiction film Black Mirror: Bandersnatch (2018), and the folk horror film Midsommar (2019). In 2021, he had a recurring role in the Hulu miniseries Dopesick. Poulter will star as Adam Warlock in Guardians of the Galaxy Vol. 3 (2023), set in the Marvel Cinematic Universe.